Dog barking when i let her outside for a pee… help

I have a huskey/alsation cross, each time we let her out for a pee/poo whatever time of day she barks even if there isnt anybody there. she gets 2 hours a day walk and plenty of interaction with toys etc and the other dogs we have..

I dont want to put a muzzle on but if i have to i will do so, i wanted to leave that as a last resort.. can anyone suggest anything else?

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